Low Voltage CTCSS Encoder/Decoder
13
MX165C
Notes
Min.
Typ.
Max.
Units
Decoder
Pure tone decode threshold
Composite signal decode threshold
Decode input signal level
Pure tone decode response time
Pure tone decode deresponse time
Decode response time
19
3
7
15
30
mV
RMS
mV
RMS
16
-20
95
95
3.5
140
170
250
250
dB
13,14
13,15
3,6,10
3,10
115
130
ms
ms
ms
ms
Deresponse time
180
Decode selectivity:
Upper decode band edge
Lower decode band edge
Serial / Parallel Inputs
3,11,19,20
1.005f
1.015f
0.985f
0.995f
0+1
Hz
Hz
0
0
3,11,19,20 1.005f
0.995f
0
0-1
0
Parallel Set Up Time (t
)
400
400
400
400
400
400
400
ns
ns
SP
Load / Latch Pulse Width (t )
L
Serial Clock Pulse Width (t )
ns
C
Serial Data Set-Up Time (t
)
ns
SS
Serial Data Hold Time (t )
ns
H
Serial Enable Time (t )
ns
1
Serial Load / Latch Set-Up Time (t )
ns
2
Serial Clock Frequency
1
MHz
Operating Characteristics Notes:
1. Refers to RX/TX, PTL, Decode Comparator Input, D0-D5.
2. All logic outputs.
3. Composite signal test condition.
4. Any programming tone and R = 10kΩ, C = 15pF.
L
L
5. With an input level of 0dB @1kHz
6. f >100Hz (for 100 Hz> f >67Hz: t=100/ f Hz x 250ms)
0
0
0
7. See Figure 3.
8. Measured in a 30kHz bandwidth.
9. With an input level of -3.5dB @1kHz
10. Per TIA/EIA-603.
11. Per TIA/EIA-603, device will not decode adjacent TIA/EIA-603 Tones.
12. Tone output level is proportional to V
.
DD
13. f =156.7Hz @ -20dB.
0
14. Typically 12.5 Tone Cycles + 40ms.
15. Typically 7 Tone Cycles + 90ms.
16. Max composite signal is 3.5dB with:
Noise (band limited 6kHz Gaussian) = -12dB ref. to 1kHz test tone
f CTCSS tone = -20dB ref. to 1kHz test tone
0
17. For maximum dynamic range, set audio level to 0dB, V x150mV
, using minimum V under which system is
RMS DD
DD
intended to work. (e.g. for a 2.7V system, use 0dB equal to 405mV
).
RMS
18. By characterization only.
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480102.008
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
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